genirq: Add IRQ_SET_MASK_OK_DONE to support stacked irqchip

Add IRQ_SET_MASK_OK_DONE in addition to IRQ_SET_MASK_OK and
IRQ_SET_MASK_OK_NOCOPY to support stacked irqchip. IRQ_SET_MASK_OK_DONE
is the same as IRQ_SET_MASK_OK to irq core. To stacked irqchip, it means
that ascendant irqchips have done all the work and no more handling
needed in descendant irqchips.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Yingjoe Chen <yingjoe.chen@mediatek.com>
Cc: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/irq.h b/include/linux/irq.h
index d58e58935465..566b1e541323 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -114,10 +114,14 @@ enum {
  *
  * IRQ_SET_MASK_OK      - OK, core updates irq_data.affinity
  * IRQ_SET_MASK_NOCPY   - OK, chip did update irq_data.affinity
+ * IRQ_SET_MASK_OK_DONE - Same as IRQ_SET_MASK_OK for core. Special code to
+ *                        support stacked irqchips, which indicates skipping
+ *                        all descendent irqchips.
  */
 enum {
         IRQ_SET_MASK_OK = 0,
         IRQ_SET_MASK_OK_NOCOPY,
+        IRQ_SET_MASK_OK_DONE,
 };
 
 struct msi_desc;
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 0a9104b4608b..80692373abd6 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -183,6 +183,7 @@ int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
         ret = chip->irq_set_affinity(data, mask, force);
         switch (ret) {
         case IRQ_SET_MASK_OK:
+        case IRQ_SET_MASK_OK_DONE:
                 cpumask_copy(data->affinity, mask);
         case IRQ_SET_MASK_OK_NOCOPY:
                 irq_set_thread_affinity(desc);
@@ -600,6 +601,7 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
 
         switch (ret) {
         case IRQ_SET_MASK_OK:
+        case IRQ_SET_MASK_OK_DONE:
                 irqd_clear(&desc->irq_data, IRQD_TRIGGER_MASK);
                 irqd_set(&desc->irq_data, flags);